Abstract

The Lozere granitic sands of the Paris basin, France, Miocene in age, seem to be due to disintegration of granitic shingles and gravels. On the basis of granulometric, mineralogic, and morphoscopic observations three types are recognized: (1) the type Lozere sands, undisturbed deposits whose westernmost occurrence is in the Rouen region; (2) reworked deposits, which extend to the channel coast; (3) reworked deposits with added foreign material (Stampian, Lutetian, but never Armorican), found only between Rouen and Beynes. From the distribution of these types, several details of the geomorphic evolution of the Paris basin are worked out, from the time of their deposition on the lower Miocene peneplain, in Burdigalian times, through the Quaternary.

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